At4g22570: APT3 (ADENINE PHOSPHORIBOSYL TRANSFERASE 3)

Encodes an adenine phosphoribosyltransferase (APT, EC 2.4.2.7), which is a constitutively expressed enzyme involved in the one-step salvage of adenine to AMP. APT3 has higher affinity for zeatin, isopentenyladenine and benzyladenine than APT1 but lower Vmax than APT1.